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/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Copyright 2016, Blender Foundation.
*/
/** \file
* \ingroup draw_engine
*
* Implementation of Blender Mist pass.
* IMPORTANT: This is a "post process" of the Z depth so it will lack any transparent objects.
*/
#include "DRW_engine.h"
#include "DRW_render.h"
#include "DNA_world_types.h"
#include "BLI_string_utils.h"
#include "eevee_private.h"
extern char datatoc_common_view_lib_glsl[];
extern char datatoc_common_uniforms_lib_glsl[];
extern char datatoc_bsdf_common_lib_glsl[];
extern char datatoc_effect_mist_frag_glsl[];
static struct {
struct GPUShader *mist_sh;
} e_data = {NULL}; /* Engine data */
void EEVEE_mist_output_init(EEVEE_ViewLayerData *sldata, EEVEE_Data *vedata)
{
const DRWContextState *draw_ctx = DRW_context_state_get();
EEVEE_FramebufferList *fbl = vedata->fbl;
DefaultTextureList *dtxl = DRW_viewport_texture_list_get();
EEVEE_TextureList *txl = vedata->txl;
EEVEE_StorageList *stl = vedata->stl;
EEVEE_PassList *psl = vedata->psl;
EEVEE_EffectsInfo *effects = stl->effects;
EEVEE_PrivateData *g_data = stl->g_data;
Scene *scene = draw_ctx->scene;
float clear[4] = {0.0f, 0.0f, 0.0f, 0.0f};
if (e_data.mist_sh == NULL) {
char *frag_str = BLI_string_joinN(datatoc_common_view_lib_glsl,
datatoc_common_uniforms_lib_glsl,
datatoc_bsdf_common_lib_glsl,
datatoc_effect_mist_frag_glsl);
e_data.mist_sh = DRW_shader_create_fullscreen(frag_str, "#define FIRST_PASS\n");
MEM_freeN(frag_str);
}
/* Create FrameBuffer. */
/* Should be enough precision for many samples. */
DRW_texture_ensure_fullscreen_2d(&txl->mist_accum, GPU_R32F, 0);
GPU_framebuffer_ensure_config(&fbl->mist_accum_fb,
{GPU_ATTACHMENT_NONE, GPU_ATTACHMENT_TEXTURE(txl->mist_accum)});
/* Clear texture. */
if (DRW_state_is_image_render() || effects->taa_current_sample == 1) {
GPU_framebuffer_bind(fbl->mist_accum_fb);
GPU_framebuffer_clear_color(fbl->mist_accum_fb, clear);
}
/* Mist settings. */
if (scene && scene->world) {
g_data->mist_start = scene->world->miststa;
g_data->mist_inv_dist = (scene->world->mistdist > 0.0f) ? 1.0f / scene->world->mistdist : 0.0f;
switch (scene->world->mistype) {
case WO_MIST_QUADRATIC:
g_data->mist_falloff = 2.0f;
break;
case WO_MIST_LINEAR:
g_data->mist_falloff = 1.0f;
break;
case WO_MIST_INVERSE_QUADRATIC:
g_data->mist_falloff = 0.5f;
break;
}
}
else {
float near = -sldata->common_data.view_vecs[0][2];
float range = sldata->common_data.view_vecs[1][2];
/* Fallback */
g_data->mist_start = near;
g_data->mist_inv_dist = 1.0f / fabsf(range);
g_data->mist_falloff = 1.0f;
}
/* XXX ??!! WHY? If not it does not match cycles. */
g_data->mist_falloff *= 0.5f;
/* Create Pass and shgroup. */
DRW_PASS_CREATE(psl->mist_accum_ps, DRW_STATE_WRITE_COLOR | DRW_STATE_BLEND_ADD);
DRWShadingGroup *grp = DRW_shgroup_create(e_data.mist_sh, psl->mist_accum_ps);
DRW_shgroup_uniform_texture_ref(grp, "depthBuffer", &dtxl->depth);
DRW_shgroup_uniform_block(grp, "common_block", sldata->common_ubo);
DRW_shgroup_uniform_block(grp, "renderpass_block", sldata->renderpass_ubo.combined);
DRW_shgroup_uniform_vec3(grp, "mistSettings", &g_data->mist_start, 1);
DRW_shgroup_call(grp, DRW_cache_fullscreen_quad_get(), NULL);
}
void EEVEE_mist_output_accumulate(EEVEE_ViewLayerData *UNUSED(sldata), EEVEE_Data *vedata)
{
EEVEE_FramebufferList *fbl = vedata->fbl;
EEVEE_PassList *psl = vedata->psl;
if (fbl->mist_accum_fb != NULL) {
GPU_framebuffer_bind(fbl->mist_accum_fb);
DRW_draw_pass(psl->mist_accum_ps);
/* Restore */
GPU_framebuffer_bind(fbl->main_fb);
}
}
void EEVEE_mist_free(void)
{
DRW_SHADER_FREE_SAFE(e_data.mist_sh);
}
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